In an Experiment, Teachers' Judgments Are Used to Measure the Amount

Multiple Choice

In an experiment, teachers' judgments are used to measure the amount of misbehavior among students. The teachers are more likely to judge a given behavior as misbehavior at the posttest than they are at the pretest. This example most clearly illustrates which threat to the internal validity of the experiment

A) testing
B) instrumentation
C) history
D) statistical regression